STATE TK-310CX3 1**

The 209 therms figure is computed by this site; the registry does not publish it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the high draw pattern. For the STATE TK-310CX3 1**, the registered UEF is 0.81. Both inputs come from the DOE CCD, retrieved 2026-09-19. The figure holds only at the federal test's daily draw. A household drawing more hot water than the test would use more gas, and one drawing less would use less. How much more or less is not available from the registry data. The full steps are set out in how the annual energy and cost figures are calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The unit's registered maximum flow rate in gallons per minute is 4.7. Among the 397 gas tankless units registered at the high draw pattern, its use of 209 therms places it in the highest quarter of its class for energy use. Models ranked ahead of its 323rd place use less gas at the same test draw. This page gives no energy figure for this model at other draw patterns, so a smaller household's use is not available here. To compare models registered in the same class, use the same-class replacement search by model number.

This text gives no running cost for the STATE TK-310CX3 1**. The cost depends on the reader's state average residential gas price, which varies by location. The page computes it from the reader's ZIP, applied to the 209 therms yearly figure at the high draw pattern. The 27 therms gap above the class median of 182 therms carries into that cost in the same proportion to the local gas price. To run the figure on your own rate, use the water heater running cost calculator for your ZIP. The installed-cost range appears in its own block on this page, with its source and date. It is a modeled range, not a quote.